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<!DOCTYPE html><html><head><meta charset="utf-8"><meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"><title>Core Components – React Native | A framework for building native apps using React</title><meta name="viewport" content="width=device-width"><meta property="og:title" content="Core Components – React Native | A framework for building native apps using React"><meta property="og:type" content="website"><meta property="og:url" content="http://facebook.github.io/react-native/index.html"><meta property="og:image" content="http://facebook.github.io/react-native/img/opengraph.png?2"><meta property="og:description" content="A framework for building native apps using React"><base href="/react-native/"><link rel="stylesheet" href="https://cdn.jsdelivr.net/docsearch.js/1/docsearch.min.css"><link rel="shortcut icon" href="img/favicon.png?2"><link rel="stylesheet" href="css/react-native.css"><script type="text/javascript" src="//use.typekit.net/vqa1hcx.js"></script><script type="text/javascript">try{Typekit.load();}catch(e){}</script></head><body><div class="container"><div class="nav-main"><div class="wrap"><a class="nav-home" href=""><img src="img/header_logo.png">React Native</a><a class="nav-version" href="/react-native/versions.html">0.27</a><div class="nav-site-wrapper"><ul class="nav-site nav-site-internal"><li><a href="docs/getting-started.html" class="active" data-target=".nav-docs">Docs</a></li><li><a href="support.html" class="">Support</a></li><li><a href="showcase.html" class="">Showcase</a></li><li><a href="blog/" class="">Blog</a></li></ul><div class="algolia-search-wrapper"><input id="algolia-doc-search" type="text" placeholder="Search docs..."></div><ul class="nav-site nav-site-external"><li><a href="https://github.com/facebook/react-native" class="">GitHub</a></li><li><a href="http://facebook.github.io/react" class="">React</a></li></ul></div></div></div><section class="content wrap documentationContent"><div class="nav-docs"><div class="nav-docs-viewport"><div class="nav-docs-section"><h3>Quick Start</h3><ul><li><a style="margin-left:0;" class="" href="docs/getting-started.html">Getting Started</a></li></ul></div><div class="nav-docs-section"><h3>Tutorials</h3><ul><li><a style="margin-left:0;" class="active" href="docs/tutorial-core-components.html">Core Components</a></li></ul></div><div class="nav-docs-section"><h3>Sample Applications</h3><ul><li><a style="margin-left:0;" class="" href="docs/sample-application-movies.html">Movie Fetcher</a></li><li><a target="_blank" style="margin-left:0;" class="" href="http://makeitopen.com/">F8 2016 App</a></li></ul></div><div class="nav-docs-section"><h3>Community Resources</h3><ul><li><a style="margin-left:0;" class="" href="docs/videos.html">Videos</a></li><li><a target="_blank" style="margin-left:0;" class="" href="http://reactnative.cc/">Newsletter</a></li></ul></div><div class="nav-docs-section"><h3>Guides</h3><ul><li><a style="margin-left:0;" class="" href="docs/style.html">Style</a></li><li><a style="margin-left:0;" class="" href="docs/images.html">Images</a></li><li><a style="margin-left:0;" class="" href="docs/gesture-responder-system.html">Gesture Responder System</a></li><li><a style="margin-left:0;" class="" href="docs/animations.html">Animations</a></li><li><a style="margin-left:0;" class="" href="docs/accessibility.html">Accessibility</a></li><li><a style="margin-left:0;" class="" href="docs/direct-manipulation.html">Direct Manipulation</a></li><li><a style="margin-left:0;" class="" href="docs/debugging.html">Debugging</a></li><li><a style="margin-left:0;" class="" href="docs/testing.html">Testing</a></li><li><a style="margin-left:0;" class="" href="docs/javascript-environment.html">JavaScript Environment</a></li><li><a style="margin-left:0;" class="" href="docs/navigator-comparison.html">Navigator Comparison</a></li><li><a style="margin-left:0;" class="" href="docs/known-issues.html">Known Issues</a></li><li><a style="margin-left:0;" class="" href="docs/performance.html">Performance</a></li><li><a style="margin-left:0;" class="" href="docs/upgrading.html">Upgrading</a></li><li><a style="margin-left:0;" class="" href="docs/platform-specific-code.html">Platform Specific Code</a></li></ul></div><div class="nav-docs-section"><h3>Guides (iOS)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-ios.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-ios.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/linking-libraries-ios.html">Linking Libraries</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device-ios.html">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/embedded-app-ios.html">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/communication-ios.html">Communication between native and React Native</a></li></ul></div><div class="nav-docs-section"><h3>Guides (Android)</h3><ul><li><a style="margin-left:0;" class="" href="docs/native-modules-android.html">Native Modules</a></li><li><a style="margin-left:0;" class="" href="docs/native-components-android.html">Native UI Components</a></li><li><a style="margin-left:0;" class="" href="docs/running-on-device-android.html">Running On Device</a></li><li><a style="margin-left:0;" class="" href="docs/embedded-app-android.html">Integrating with Existing Apps</a></li><li><a style="margin-left:0;" class="" href="docs/signed-apk-android.html">Generating Signed APK</a></li><li><a style="margin-left:0;" class="" href="docs/android-ui-performance.html">Profiling Android UI Performance</a></li><li><a style="margin-left:0;" class="" href="docs/android-building-from-source.html">Building React Native from source</a></li></ul></div><div class="nav-docs-section"><h3>components</h3><ul><li><a style="margin-left:0;" class="" href="docs/activityindicatorios.html">ActivityIndicatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerios.html">DatePickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/drawerlayoutandroid.html">DrawerLayoutAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/image.html">Image</a></li><li><a style="margin-left:0;" class="" href="docs/listview.html">ListView</a></li><li><a style="margin-left:0;" class="" href="docs/mapview.html">MapView</a></li><li><a style="margin-left:0;" class="" href="docs/modal.html">Modal</a></li><li><a style="margin-left:0;" class="" href="docs/navigator.html">Navigator</a></li><li><a style="margin-left:0;" class="" href="docs/navigatorios.html">NavigatorIOS</a></li><li><a style="margin-left:0;" class="" href="docs/pickerios.html">PickerIOS</a></li><li><a style="margin-left:0;" class="" href="docs/picker.html">Picker</a></li><li><a style="margin-left:0;" class="" href="docs/progressbarandroid.html">ProgressBarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/progressviewios.html">ProgressViewIOS</a></li><li><a style="margin-left:0;" class="" href="docs/refreshcontrol.html">RefreshControl</a></li><li><a style="margin-left:0;" class="" href="docs/scrollview.html">ScrollView</a></li><li><a style="margin-left:0;" class="" href="docs/segmentedcontrolios.html">SegmentedControlIOS</a></li><li><a style="margin-left:0;" class="" href="docs/slider.html">Slider</a></li><li><a style="margin-left:0;" class="" href="docs/sliderios.html">SliderIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbar.html">StatusBar</a></li><li><a style="margin-left:0;" class="" href="docs/switch.html">Switch</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios.html">TabBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/tabbarios-item.html">TabBarIOS.Item</a></li><li><a style="margin-left:0;" class="" href="docs/text.html">Text</a></li><li><a style="margin-left:0;" class="" href="docs/textinput.html">TextInput</a></li><li><a style="margin-left:0;" class="" href="docs/toolbarandroid.html">ToolbarAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/touchablehighlight.html">TouchableHighlight</a></li><li><a style="margin-left:0;" class="" href="docs/touchablenativefeedback.html">TouchableNativeFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/touchableopacity.html">TouchableOpacity</a></li><li><a style="margin-left:0;" class="" href="docs/touchablewithoutfeedback.html">TouchableWithoutFeedback</a></li><li><a style="margin-left:0;" class="" href="docs/view.html">View</a></li><li><a style="margin-left:0;" class="" href="docs/viewpagerandroid.html">ViewPagerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/webview.html">WebView</a></li></ul></div><div class="nav-docs-section"><h3>apis</h3><ul><li><a style="margin-left:0;" class="" href="docs/actionsheetios.html">ActionSheetIOS</a></li><li><a style="margin-left:0;" class="" href="docs/alert.html">Alert</a></li><li><a style="margin-left:0;" class="" href="docs/alertios.html">AlertIOS</a></li><li><a style="margin-left:0;" class="" href="docs/animated.html">Animated</a></li><li><a style="margin-left:0;" class="" href="docs/appregistry.html">AppRegistry</a></li><li><a style="margin-left:0;" class="" href="docs/appstateios.html">AppStateIOS</a></li><li><a style="margin-left:0;" class="" href="docs/appstate.html">AppState</a></li><li><a style="margin-left:0;" class="" href="docs/asyncstorage.html">AsyncStorage</a></li><li><a style="margin-left:0;" class="" href="docs/backandroid.html">BackAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/cameraroll.html">CameraRoll</a></li><li><a style="margin-left:0;" class="" href="docs/clipboard.html">Clipboard</a></li><li><a style="margin-left:0;" class="" href="docs/datepickerandroid.html">DatePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/dimensions.html">Dimensions</a></li><li><a style="margin-left:0;" class="" href="docs/intentandroid.html">IntentAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/interactionmanager.html">InteractionManager</a></li><li><a style="margin-left:0;" class="" href="docs/layoutanimation.html">LayoutAnimation</a></li><li><a style="margin-left:0;" class="" href="docs/linking.html">Linking</a></li><li><a style="margin-left:0;" class="" href="docs/linkingios.html">LinkingIOS</a></li><li><a style="margin-left:0;" class="" href="docs/nativemethodsmixin.html">NativeMethodsMixin</a></li><li><a style="margin-left:0;" class="" href="docs/netinfo.html">NetInfo</a></li><li><a style="margin-left:0;" class="" href="docs/panresponder.html">PanResponder</a></li><li><a style="margin-left:0;" class="" href="docs/pixelratio.html">PixelRatio</a></li><li><a style="margin-left:0;" class="" href="docs/pushnotificationios.html">PushNotificationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/statusbarios.html">StatusBarIOS</a></li><li><a style="margin-left:0;" class="" href="docs/stylesheet.html">StyleSheet</a></li><li><a style="margin-left:0;" class="" href="docs/timepickerandroid.html">TimePickerAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/toastandroid.html">ToastAndroid</a></li><li><a style="margin-left:0;" class="" href="docs/vibrationios.html">VibrationIOS</a></li><li><a style="margin-left:0;" class="" href="docs/vibration.html">Vibration</a></li></ul></div><div class="nav-docs-section"><h3>Polyfills</h3><ul><li><a style="margin-left:0;" class="" href="docs/flexbox.html">Flexbox</a></li><li><a style="margin-left:0;" class="" href="docs/shadowproptypesios.html">ShadowPropTypesIOS</a></li><li><a style="margin-left:0;" class="" href="docs/geolocation.html">Geolocation</a></li><li><a style="margin-left:0;" class="" href="docs/network.html">Network</a></li><li><a style="margin-left:0;" class="" href="docs/timers.html">Timers</a></li><li><a style="margin-left:0;" class="" href="docs/colors.html">Colors</a></li></ul></div></div></div><div class="inner-content"><a id="content"></a><table width="100%"><tbody><tr><td><h1><a class="anchor" name="core-components"></a>Core Components <a class="hash-link" href="docs/tutorial-core-components.html#core-components">#</a></h1></td><td style="text-align:right;"><a target="_blank" href="https://github.com/facebook/react-native/blob/0.27-stable/docs/Tutorial-CoreComponents.md">Edit on GitHub</a></td></tr></tbody></table><div><p>Components are the building blocks for a React Native application. A React Native user interface (UI) is specified by declaring components, possibly nested, and then those components are mapped to the native UI on the targeted platform.</p><p>React Native has a number of core components that are commonly used in applications, either on their own or combined to build new components.</p><h2><a class="anchor" name="text"></a>Text <a class="hash-link" href="docs/tutorial-core-components.html#text">#</a></h2><p>The most basic component in React Native is the <a href="/react-native/docs/text.html#content" target=""><code>Text</code></a> component. The <code>Text</code> component simply renders text.</p><p>This example displays the <code>string</code> <code>"Hello"</code> on the device.</p><div class="prism language-javascript">import React from <span class="token string">'react'</span><span class="token punctuation">;</span>
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import <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> Text <span class="token punctuation">}</span> from <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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const App <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<Text<span class="token operator">></span>Hello World<span class="token operator">!</span><<span class="token operator">/</span>Text<span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// App registration and rendering
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'MyApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> App<span class="token punctuation">)</span><span class="token punctuation">;</span></div><h2><a class="anchor" name="image"></a>Image <a class="hash-link" href="docs/tutorial-core-components.html#image">#</a></h2><p>The other basic React Native component is the <a href="/react-native/docs/image.html#content" target=""><code>Image</code></a> component. Like <code>Text</code>, the <code>Image</code> component simply renders an image.</p><blockquote><p>An <code>Image</code> is analogous to using <code>img</code> when building websites.</p></blockquote><p>The simplest way to render an image is to provide a source file to that image via the <code>source</code> attribute.</p><p>This example displays a checkbox <code>Image</code> on the device.</p><div class="prism language-javascript">import React from <span class="token string">'react'</span><span class="token punctuation">;</span>
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import <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> Image <span class="token punctuation">}</span> from <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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const App <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<Image source<span class="token operator">=</span><span class="token punctuation">{</span><span class="token function">require<span class="token punctuation">(</span></span><span class="token string">'./img/check.png'</span><span class="token punctuation">)</span><span class="token punctuation">}</span> <span class="token operator">/</span><span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// App registration and rendering
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'MyApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> App<span class="token punctuation">)</span><span class="token punctuation">;</span></div><h2><a class="anchor" name="view"></a>View <a class="hash-link" href="docs/tutorial-core-components.html#view">#</a></h2><p>A <a href="/react-native/docs/view.html#content" target=""><code>View</code></a> is the most basic building block for a React Native application. The <code>View</code> is an abstraction on top of the target platform's native equivalent, such as iOS's <code>UIView</code>.</p><blockquote><p>A <code>View</code> is analogous to using a <code>div</code> for building websites.</p></blockquote><p>While basic components such as <code>Text</code> and <code>Image</code>, can be displayed without a <code>View</code>, this is not generally recommended since the <code>View</code> gives you the control for styling and layout of those components.</p><p>This example creates a <code>View</code> that aligns the <code>string</code> <code>Hello</code> in the top center of the device, something which could not be done with a <code>Text</code> component alone (i.e., a <code>Text</code> component without a <code>View</code> would place the <code>string</code> in a fixed location in the upper corner):</p><div class="prism language-javascript">import React from <span class="token string">'react'</span><span class="token punctuation">;</span>
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import <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> Text<span class="token punctuation">,</span> View <span class="token punctuation">}</span> from <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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const App <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<View style<span class="token operator">=</span><span class="token punctuation">{</span><span class="token punctuation">{</span>alignItems<span class="token punctuation">:</span> <span class="token string">'center'</span><span class="token punctuation">}</span><span class="token punctuation">}</span><span class="token operator">></span>
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<Text<span class="token operator">></span>Hello<span class="token operator">!</span><<span class="token operator">/</span>Text<span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// App registration and rendering
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'MyApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> App<span class="token punctuation">)</span><span class="token punctuation">;</span></div><h2><a class="anchor" name="textinput"></a>TextInput <a class="hash-link" href="docs/tutorial-core-components.html#textinput">#</a></h2><p>Direct text-based user input is a foundation for many apps. Writing a post or comment on a page is a canonical example of this. <a href="/react-native/docs/textinput.html#content" target=""><code>TextInput</code></a> is a basic component that allows the user to enter text.</p><p>This example creates a simple <code>TextInput</code> box with the <code>string</code> <code>Hello</code> as the placeholder when the <code>TextInput</code> is empty.</p><div class="prism language-javascript">import React<span class="token punctuation">,</span> <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> TextInput<span class="token punctuation">,</span> View <span class="token punctuation">}</span> from <span class="token string">'react-native'</span>
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const App <span class="token operator">=</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> <span class="token punctuation">{</span>
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<span class="token keyword">return</span> <span class="token punctuation">(</span>
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<View<span class="token operator">></span>
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<TextInput placeholder<span class="token operator">=</span><span class="token string">"Hello"</span> <span class="token operator">/</span><span class="token operator">></span>
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<<span class="token operator">/</span>View<span class="token operator">></span>
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<span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token punctuation">}</span>
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<span class="token comment" spellcheck="true">
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// App registration and rendering
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</span>AppRegistry<span class="token punctuation">.</span><span class="token function">registerComponent<span class="token punctuation">(</span></span><span class="token string">'MyApp'</span><span class="token punctuation">,</span> <span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> App<span class="token punctuation">)</span><span class="token punctuation">;</span></div><h2><a class="anchor" name="listview"></a>ListView <a class="hash-link" href="docs/tutorial-core-components.html#listview">#</a></h2><p>On mobile devices, lists are a core element in many applications. The <a href="/react-native/docs/listview.html#content" target=""><code>ListView</code></a> component is a special type of <a href="/react-native/docs/tutorials/core-components.html#view" target=""><code>View</code></a> that displays a vertically scrolling list of changing data.</p><p>The <code>ListView</code> component requires two properties, <code>dataSource</code> and <code>renderRow</code>. <code>dataSource</code> is the actual source of information that will be part of the list. <code>renderRow</code> takes the data and returns a renderable component to display.</p><p>This example creates a simple <code>ListView</code> of hardcoded data. It first initializes the <code>datasource</code> that will be used to populate the <code>ListView</code>. Then it renders that <code>ListView</code> with that data.</p><blockquote><p>A <code>rowHasChanged</code> function is required to use <code>ListView</code>. Here we just say a row has changed if the row we are on is not the same as the previous row.</p></blockquote><div class="prism language-javascript">import React from <span class="token string">'react'</span><span class="token punctuation">;</span>
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import <span class="token punctuation">{</span> AppRegistry<span class="token punctuation">,</span> Text<span class="token punctuation">,</span> View<span class="token punctuation">,</span> ListView<span class="token punctuation">}</span> from <span class="token string">'react-native'</span><span class="token punctuation">;</span>
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<span class="token keyword">var</span> SimpleList <span class="token operator">=</span> React<span class="token punctuation">.</span><span class="token function">createClass<span class="token punctuation">(</span></span><span class="token punctuation">{</span>
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<span class="token comment" spellcheck="true"> // Initialize the hardcoded data
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</span> getInitialState<span class="token punctuation">:</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
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<span class="token keyword">var</span> ds <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ListView<span class="token punctuation">.</span>DataSource</span><span class="token punctuation">(</span><span class="token punctuation">{</span>rowHasChanged<span class="token punctuation">:</span> <span class="token punctuation">(</span>r1<span class="token punctuation">,</span> r2<span class="token punctuation">)</span> <span class="token operator">=</span><span class="token operator">></span> r1 <span class="token operator">!</span><span class="token operator">==</span> r2<span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
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<span class="token keyword">return</span> <span class="token punctuation">{</span>
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